According to the firms, the agreement will expand the use of such cards to POS terminals across the globe wherever the Discover and Diners brands are accepted.

EVERTEC EVP Mike Vizcarrondo said the firm sees Discover as a solid partner for not only growing the acceptance of our brand outside of our main markets, but also for offering more options to ATH member institutions.

Discover Payments Services EVP and president Diane Offereins said the firm will continue to expand globally by partnering with key networks throughout the world and welcomes ATH to the Discover family of networks and strengthening its presence in Puerto Rico and the Caribbean.

"We believe that ATH financial institutions will see immediate, clear benefit from our compelling value proposition, card features and the flexibility the Discover Network provides," Offereins said.

Users can use these cards to make online purchases, as well as payments at different places such as parking terminals, where PIN debit transactions are not an option.

EVERTEC, a private equity and capital markets investor, is owned 51% by an affiliate of Apollo Management VII and 49% managed by Popular.

EVERTEC owns and operates the ATH network, the leading debit payment and ATM network in Puerto Rico.